Air hammer



A. G. MACK.

AIR HAMMER.

APPLICATION FILED JAN. 6. 1920.

Patented. Nov. 21, 1922.

Patented Nov. 21, 1922.

AUGUST G. MACK, OF OOLITIC, INDIANA.

AIR HAIVIIVIER.

Application filed January 8, 1920. Serial No. 349,692.

To all whom it may concern.

Be it known that I, AUcUsT G. MACK, a citizen of the United States, residing at Oolitic, in the county of Lawrence and State the provision of means which will eliminate I excessive vibration created by the hammer and received by a persons hand while operating the device and which has proven very injurious to the person or operator on continuous use of such a device.

Another object of this invention is the provision of a handle for pneumatic hammers of the above stated character, which can be easily and quickly applied to an ordinary pneumatic hammer without altering the construction thereof and which shall be simple, durable and eflicient, and which may be manufactured and sold at a comparatively low cost.

lVith these and other objects in view as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination, and arrangement of parts as will be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is a side elevation of a handle constructed in accordance with my invention and illustrating the same applied to a pneumatic hammer,

Figure 2 is a vertical sectional view of the same,

Figure 3 is a side elevation illustrating a modified form of handle and showing the same applied to a pneumatic hammer,

Figure 4 is a vertical sectional view of the same,

Referring in detail to the drawing, the numeral 1 indicates as an entirety an ordinary pneumatic hammer including a body 2 having connected at one end. the usual air supply hose 3 and a chuck 1 at its other end to receive and grip an ordinary tool used in connection with the hammer. The chuck 4 forms a part of the body 2 of the hammer and defines an annular shoulder 5 and the other end of said body is reduced as illus trated at 6 to define an annular shoulder 7. The foregoing description relates to a well known construction of pneumatic hammer and to which my invention is applied. A handle 8'consisting of a tubularxbody 9 has formed on one end an inwardly directed flange 10 that receives the reduced end def the body 2 of the hammer and is spaced from the annular shoulder 7. A cushioning washer 11 is interposed between the shoulder 7 and the inwardly directed flange 10 and this washer is constructed from rubber or any other material suitable for the purpose. The body 9 of the handle 8 is of such a size that it will permit the body 2 of the hammer to have free movement therein and the other end of said body 9 is reduced and screw threaded to form an attaching neck 12.

A cap 13 is threaded to the neck 12 and has formed thereon an inwardly directed flange 14 which is spaced from the annular shoulder 5 of the body 2 forming an oil space and also permitting the hammer body 2 to have play within the handle 8 so that the excessive vibration set up by the pneumatic hammer when in operation will be expended by the movement permitted of the hammer 2 within the handle 8 thereby re ducing the vibration received by a persons hand gripping the handle 8.

Referring to my modified form of invention as disclosed in Figures 3 and 4, the hammer 15 consists of a body 16 having a reduced end 17 provided with an exhaust port 18 and said reduced end has connected thereto the usual supply hose 3. The other end of the body 16 is reduced and has slidably mounted therein the plunger 19 adapted to strike the tool carried by the chuck 20. In this instance the chuck 20 is a separate element from the hammer 15.

My modified form of handle includes a cylindrical body 21 which receives the body 16 of the hammer 15 and has one end restricted to form an annular shoulder 22 and an opening 23 to permit the reduced end of the body to extend therethrough.

The reduced end 17 of the body 16 of the hammer 15 is provided with an annular shoulder 24% against which is positioned a cushioning washer 25 and which washer is adapted to abut the shoulder 22 during the movement of the hammer within the handle. The other end of the handle 21 is internally screw threaded and has threaded connection with the chuck 20 which forms a closure for,

said end of the handle, and which is spaced from the end of the body 16 of the hammer so as to permit said bOCly of the hammer to move backward and forwardly Within the handle 21 and which movement is caused by the excessive vibration set up by the hammer. Owing to the movement permitted the hammer within the handle reduces the vibration to a persons hand gripping; the handle 21.

The handle 21 adjacent the restricted end is provided with an exhaust port 26 topermit the exhaust escaping from the exhaust port 18 to pass exteriorly of the handle.

While I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction, combination, and arrangement of parts may be made without departing from the spirit ant.

l scope as claimed.

Having thus described my inventiomwhat I claim is an attachment for a tool of the class described provided with spaced shoulders, a sleeve to serve as a handle enclosing a part of the tool, said sleeve being in sections separable to permit passage over the tool, each section having a shoulder to engage said shoulders, the sleeve beingloose on the tool and having its shoulders farther apart than those of the tool, one of the sections of the sleeve being a chuck, the inner end of the chuck serving as one of the shoulders of the sleeve, the tool having a plunger, and the chuck having a tool retaining recess into which the plunger extends.

of the invention In testimony whereof I affix my signaturein presence of two witnesses.

AUGUST G. MACK.

Witnesses Nancy A. CANNER, ALLEN CARTER. 

